SharePoint iOS app doesn't match the SPO list

I am using the SharePoint iOS app to connect to a calendar in SPO. I have 2 issues:

1. The Title field has been set to optional. I went back and also set it to hidden. In either case, I can not only see the Title field showing when I try to add a new calendar event through the app but I also get a message 'The title cannot be empty.' Adding a calendar event through the web works as expected.

2. I renamed the Title column and added/removed choices from Category.  These same changes aren't reflected in the mobile app.  I only see the default column names and data associated to each.

Again, the web version shows the updates I made to the different columns and allows me to submit a new calendar event when the Title field is blank.  I've created lists in multiple SPO site collections to test on mobile and get the same result.  Deleting the data withing the app and deleting/reinstalling the app doesn't make a difference.  I'm running the latest iOS version.

Has anybody come across this or found a workaround within the mobile app?

Seems to be related to this: 

https://answers.microsoft.com/en-us/msoffice/forum/all/missing-custom-categories-in-sharepoint-app/15e68182-5d97-4399-b449-9ac3f964ad62